Readme: Update openblack screenshot (#2899)
Readme: Update openblack screenshot (#2899)


LWJGL-CI/bgfx,LWJGL-CI/bgfx,bkaradzic/bgfx,LWJGL-CI/bgfx,LWJGL-CI/bgfx,bkaradzic/bgfx,bkaradzic/bgfx,bkaradzic/bgfx